Methanol → 4-[5-(3,5-Dichlorophenyl)-5-trifluoromethyl-4,5-dihydroisoxazol-3-yl]-2-iodo benzoic acid methyl ester

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Reaction Steps

In a solution of 0.60 g of 4-[5-(3,5-dichlorophenyl)-5-trifluoromethyl-4,5-dihydroisoxazole-3-yl]-2-iodo benzoic acid synthesized similarly to Steps 1 to 4 of Synthetic Example 4 in 10 ml of methanol, 2 drops of concentrated sulfuric acid was added, and stirred under reflux with heat for 20 hours. After the completion of the reaction, the solvent was distilled off under reduced pressure, the residue was neutralized with 10 ml of saturated sodium hydrogen carbonate aqueous solution, then extracted with ethyl acetate (10 ml×2). The organic phase was washed with water, dehydrated with saturated sodium chloride aqueous solution and dried over anhydrous sodium sulfate, and then the solvent was distilled off under reduced pressure. The residue was purified with silica gel column chromatography that was eluated with ethyl acetate-hexane (1:4), and 0.56 g of the aimed product was obtained as colorless oily substance.

Provenance & Evidence